ething like two regiments of cavalry should be left in that vicinity to occupy Winchester, and thoroughly scour the country south of the railway and up the Shenandoah Valley. * * * Occupy by grand guards Warrenton Junction and Warrenton itself, and some * * more advanced point on the Orange and Alexandria railroad.--McClellan's report.
In compliance with these instructions, Shields' division was recalled from Strasburg, and Williams' division began its movement toward Manassas on the 20th of March.
On the evening of the 21st Ashby reported that the enemy had evacuated Strasburg.
Jackson, divining that this meant a withdrawal toward Washington, at once ordered pursuit with all his. available force.
The whole of his little army reached Strasburg on the afternoon of the 22d, the greater part after a march of twenty-two miles. Meantime Ashby was following close behind the retreating enemy, and late in the afternoon of the 22d, as Jackson was entering Strasburg, Ashby was attackin